James Montgomery 'Jim' Wilson
Frankie Gilroy Wilson
Tex Harper
Sonya Dietrich Landers
George Lewis
Abigail 'Mag' MacPherson
Dr. Gregory Landers
Tom Hare
Captain Chundra
Paul, the Purser
Bland (as Peter Lynn)
Lamb
Christopher Ruggles
R. C. Bradford
Chief inspector
Captain Caldwell
Submarine Gun Crewman (uncredited)
Man on Intercom (voice) (uncredited)
Sam
News photographer
Bellhop (uncredited)
Submarine Crewman firing on the Bombay Clipper (uncredited)
Steward (uncredited)
Hotel clerk
News photographer
Chambermaid
Guard (uncredited)
Waiter
Miss Kane - Secretary (uncredited)
Submarine commander
Submarine Gun Crewman (uncredited)
Singapore Policeman (uncredited)
Submarine officer